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It is unfortunately regenerated every time an instance is launched, but if you want to test editing it is referenced in the commmandline for dnsmasq. for example on devstack:

--dhcp-hostsfile=/opt/stack/data/nova/br100.conf

Vish

On Feb 19, 2013, at 11:49 AM, Ritesh Nanda <riteshnanda09 at gmail.com> wrote:

> Thanks vish,
> 
>      Can you tell me the location of the external host file we provide to dnsmasq , so that i can try putting the directive there.
> 
> On Wed, Feb 20, 2013 at 1:07 AM, Vishvananda Ishaya <vishvananda at gmail.com> wrote:
> You cannot have an external dhcp server with openstack. Openstack needs a way to know the ip address assigned to a vm to do its listing properly. If you don't care about the api returning valid ips there is a possibility of using FlatNetworking (not FlatDHCP) to make nova stick the network into a bridge and not do any dhcp at all. You could then have an external server serving up dhcp ips. I suspect you will probably have to disable security groups completely using NoopFirewallDriver driver to get this to work.
> 
> As to the reason dhcp-host is not working, I suspect is because we give dnsmasq an external hosts file so you probably would need the host directive there.
> 
> Vish
> 
> On Feb 19, 2013, at 4:44 AM, Ritesh Nanda <riteshnanda09 at gmail.com> wrote:
> 
>> Hope Vish can answer this , what can be the way around to do this.
>> 
>> On Tue, Feb 19, 2013 at 2:01 PM, Razique Mahroua <razique.mahroua at gmail.com> wrote:
>> Hi,
>> I'm not sure the "dhcp-host" configuration option exists actually. As for having one another host in VLAN mode is something I'd be interested to know as well
>> 
>> Regards,
>> 
>> Razique Mahroua - Nuage & Co
>> razique.mahroua at gmail.com
>> Tel : +33 9 72 37 94 15
>> 
>> <NUAGECO-LOGO-Fblan_petit.jpg>
>> 
>> Le 19 févr. 2013 à 08:05, Ritesh Nanda <riteshnanda09 at gmail.com> a écrit :
>> 
>>> Hello ,
>>> 
>>> Is it possible to use external dhcp server , instead of dnsmasq .
>>> I am using openstack essex, with vlan manager as network,  I have a need where i need to implement dynamic dns, 
>>> so using dhcp3 as dhcp-server and bind9 as dns is possible.
>>> 
>>> Or is there any way in openstack i can implement dynamic dns in openstack.
>>> 
>>> One more problem which i am facing , dnsmasq has a option to assign static ip to a particular hostname using dhcp-host
>>> parameter in dnsmasq config file.
>>> 
>>> i tried it doing by defining  the config file of dnsmasq in nova.conf
>>> 
>>> --dnsmasq_config_file=/etc/nova/dnsmasq.conf
>>> 
>>> then in dnsmasq config file 
>>> 
>>> i gave options for a particular subnet.
>>>  
>>> 
>>> dhcp-range=Tenant-operator,10.0.50.3,10.0.50.254,255.255.255.0,24h
>>> dhcp-option=Tenant-operator,6,10.0.50.7
>>> domain=operator.com,10.0.50.0/24,local
>>> dhcp-host=importantmachine,10.0.50.120
>>> 
>>> these all options are working except dhcp-host.
>>> 
>>> Can anybody help me with this.
>>> -- 
>>>  With Regards  
>>>  Ritesh Nanda
>>> 
>>> 
>>> 
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>> 
>> 
>> 
>> 
>> -- 
>>  With Regards  
>>  Ritesh Nanda
>> 
>> 
>> 
>> _______________________________________________
>> Mailing list: https://launchpad.net/~openstack
>> Post to     : openstack at lists.launchpad.net
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> 
> 
> 
> 
> -- 
>  With Regards  
>  Ritesh Nanda
> 
> 
> 

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